Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e842aca1ae32a3b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 15:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d076495b385826bc23f5b472d28ade69 SHA-1: 6f3ab1d9597ce4a80d0f90be0e50da52dfbc5624 SHA-256: 7e842aca1ae32a3bb67e6691842e104bc3169a79c95f4a29115bf02b9741aa55
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing malicious software by posing as a necessary update or extension. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alicantea.centralcms.cloud/galeria/files/voxafumub.pdf In PDF document text
    • http://kiddeefire.com/media/userfiles/files/kiwetabepapawuxatugemigo.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/fexakavudu.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/fekurezijel.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/waluwimorunamun.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/letotijoferugiz.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/viroxekomekaso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d942d24ac---puxadudefabok.pdfIn PDF document text
    • http://canadanur.com/resimler/files/89026459516.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/mijexexitowen.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/8954302948.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/fojepubopetopolosepeka.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/powadasowikixonub.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/nagibanuxenabisizutuvinos.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/9720375111.pdfIn PDF document text
    • http://8njl.com/userfiles/files/87666227089.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/60401510216.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/93990431839.pdfIn PDF document text
    • http://leguido.net/files/16503524440.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/69578951642.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41066156637.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/lavimavavimegamef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+doc+reader+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC379 17636 bytes
SHA-256: a5b9ff1243e6f1a2396e3af5c73e9647815129bed02c4d644746e38fc4f7369e
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 10328 bytes
SHA-256: 8cc7856869e671b7ebb24f8338433637ad82684ea8beb27c7a00c3f3553e4dcc
font_02_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1